Sunday, 10 February 2013

Draw the Data flow diagrams of Order processing and explain it in brief

Data flow model is a way of showing how data is
processed by a system. At the analysis level, they should be used to model the
way in which data is processed in the existing system. The notation used in
this models represents functional processing, data stores and data movements
between functions. Data flow models are used to show how data flows through a
sequence of processing steps. The data is transformed at each step before
moving on to the next stage. These processing steps or transformations are
program functions when data-flow diagrams are used to document a software
design.

The model shows how the order for the goods moves from
process to process. It also shows the data stores that are involved in this
process.

There are various notation
used for data-flow diagrams. In figure rounded rectangles represent processing
steps, arrow annotated with the data name represent flows and rectangles
represent data store (data sources). Data flow diagrams have the advantages
that, unlike some other modelling notations, they are simple and intuitive.